physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
My husband gets painful canker sores all the time in his mouth. What's the deal? Thanks, Brittany. Canker sores are small ulcers that develop in the soft tissues of the mouth. They can appear under the tongue, inside the cheeks or lips and at the base of the gums. Doctors donât know exactly what causes canker sores, but they do know there are a number of contributing factors. 1  These include: 2  Having a weakened immune system. 3  Poor nutrition or vitamin deficiencies. 4  Minor injuries to the mouth. 5  Hormones. 6  Even using some toothpastes or mouth washes that contain sodium lauryl sulfate.